2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/96317We present the determination of the light quark masses using electromagnetic splittings of pions and kaons. The meson masses are calculated on $SU(3)\times U(1)$ gauge configurations, where SU(3) gauge fields include sea quark effects of two degenerate flavors and the U(1) gauge fields are incorporated in non-compact form. Possible sources of systematic uncertainty are discussed.6 pages, 2 figures, Talk presented at Lattice 2005 (Hadron spectrum and quark masses)High Energy Physics - Latticetext